How to set the NumericButtonCount of the Grid

Question

I have a DataGrid and a DataPager. I am not binding the Source of the Pager to an object which is held in memory rather I am calling a Paged Stored Procedure that retrieves records according to the Requested Page by passing the Current PageIndex and PageSize to the SP in the DataPager's PageIndexChanged event.

void OnPageIndexChanged(object sender, EventArgs e)
{
   rowIndex = (pgrProductGrids.PageIndex * pgrProductGrids.PageSize) + 1;
}

Now I want to set the NumericButtonCount for the Pager that would be set according to the Count of Total Records the Procedure will return. How and where do I need to set this?

I tried setting it like this to check:

pgrProductGrids.NumericButtonCount = 2;

but It Indicates one Page only and loads all the data on to it